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Arm or Ally is proud to team up with Aero Precision to bring you some of the finest core AR-15 components available at affordable prices. Be sure to check out our selection of AR15 BCG, and AR Barrels by Ballistic Advantage and Faxon. Don’t forget to add a gas block and gas tube with your barrel. They ship for free and we do our best to keep your cost down. What’s more?? Ballistic Advantage guarantees sub-MOA accuracy!